Width is measured across the chest below the sleeves from seam to seam. Height is measured from the bottom of the shirt to the highest point on the shoulder (where the seam meets the neck).

Please note that each product has its own specific sizing chart.
SizeWidth (inches)Height (inches)
Junior Small14.5023.25
Junior Medium15.5024.50
Junior Large16.5026
Junior XL1728
Junior Medium - White